Each manager can have not more than 3 teams, which must be from different countries.
Team has next parameters:

experience, total experience of all players

power, total power of all players

tiredness, team cant play match with tiredness more than 16, the relax will be necessary

For example, if we calculate the strength of main staff , then it equals to total experience of all players, divided by 11. If we calculate it for a whole team, then the reserve players are being taken into account.

Thus, power can be considered as Attack and Defense.
Attack = Left flank (LA) + Centre(CA) +Right flank (RA)
Defense = Left flank(LD)+Centre(CD)+Right flank(RD)